2015
DOI: 10.1038/srep16385
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Enhanced critical current density in the pressure-induced magnetic state of the high-temperature superconductor FeSe

Abstract: We investigate the relation of the critical current density (Jc) and the remarkably increased superconducting transition temperature (Tc) for the FeSe single crystals under pressures up to 2.43 GPa, where the Tc is increased by ~8 K/GPa. The critical current density corresponding to the free flux flow is monotonically enhanced by pressure which is due to the increase in Tc, whereas the depinning critical current density at which the vortex starts to move is more influenced by the pressure-induced magnetic stat… Show more

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Cited by 32 publications
(29 citation statements)
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“…From the analysis of d ρ /d T versus T curve, we observe that ( − ) also decreases with increase in pressure, indicating the decrease in Δ T c is partly intrinsic in nature. We would like to mention that qualitative similar behavior has been reported for FeSe single crystal 33 . With application of pressure, the onset of the superconducting transition gradually increases while the transition width, which is defined as the difference in temperature corresponding to 90 and 10 % of the normal-state resistivity, decreases in the low-pressure region ( P  < 0.8 GPa).…”
Section: Resultssupporting
confidence: 84%
“…From the analysis of d ρ /d T versus T curve, we observe that ( − ) also decreases with increase in pressure, indicating the decrease in Δ T c is partly intrinsic in nature. We would like to mention that qualitative similar behavior has been reported for FeSe single crystal 33 . With application of pressure, the onset of the superconducting transition gradually increases while the transition width, which is defined as the difference in temperature corresponding to 90 and 10 % of the normal-state resistivity, decreases in the low-pressure region ( P  < 0.8 GPa).…”
Section: Resultssupporting
confidence: 84%
“…In iron-chalcogenide superconductors, there have been many reports on enhancement of T c for bulk materials3334353637, wires38 and films16394041424344. Possible explanations can be grouped into three categories so far: (1) an interface effect, (2) an elimination of the influence of excess Fe at the interstitial sites of the Te/Se(S) layer and (3) a strain effect.…”
Section: Resultsmentioning
confidence: 99%
“…The third group is related to the strain effect on T c (refs 33, 34, 38), especially in iron-chalcogenide superconducting films1641424344. Figure 2b shows a cross-sectional HRTEM image of the FST film irradiated with 190 keV proton.…”
Section: Resultsmentioning
confidence: 99%
“…[15][16][17][18] Since FeCh tetrahedra could be incorporated in different superconducting materials, it is of interest to study critical currents and vortex pinning mechanism in tetragonal FeS. [19][20][21] Moreover, vortex pinning and dynamics is strongly related to coherence length and superconducting pairing mechanism.…”
Section: 14mentioning
confidence: 99%